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Lab talk, the good, the bad, and the ugly
Porcelain
"All-Porcelain" Crowns
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<blockquote data-quote="CoolHandLuke" data-source="post: 352898" data-attributes="member: 4850"><p>porcelain needs to be fused to a framework material, it will not have any strength without a base material to which the porcelain sticks.</p><p></p><p>so a zirconia framework or an emax framework can be made that gives the porcelain an even thickness and room to generate shade.</p><p></p><p>an all porcelain crown cannot mean a porcelain crown minus its framework.</p><p></p><p>in ye olden days porcelain jacekted crowns that wanted to avoid the use of metals used the precursor material to zirconia - "alumina"</p><p></p><p>this is no longer done except by a handful of providers.</p><p></p><p>all-porcelain must mean porcelain on all aspects of the visible areas. this is a departure really, back to roughly 2008-2009 when porcelain bonded to zirconia became a big deal.</p><p></p><p>nowadays people more use zirconia in all aspects except for a "window" area cut into the front of the crown, the part you can see. this saves porcelain and has a higher strength because the majority of the crown is now zirconia instead of porcelain.</p></blockquote><p></p>
[QUOTE="CoolHandLuke, post: 352898, member: 4850"] porcelain needs to be fused to a framework material, it will not have any strength without a base material to which the porcelain sticks. so a zirconia framework or an emax framework can be made that gives the porcelain an even thickness and room to generate shade. an all porcelain crown cannot mean a porcelain crown minus its framework. in ye olden days porcelain jacekted crowns that wanted to avoid the use of metals used the precursor material to zirconia - "alumina" this is no longer done except by a handful of providers. all-porcelain must mean porcelain on all aspects of the visible areas. this is a departure really, back to roughly 2008-2009 when porcelain bonded to zirconia became a big deal. nowadays people more use zirconia in all aspects except for a "window" area cut into the front of the crown, the part you can see. this saves porcelain and has a higher strength because the majority of the crown is now zirconia instead of porcelain. [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Porcelain
"All-Porcelain" Crowns
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